diff --git a/lib/dpul_collections/indexing_pipeline/figgy/hydration_cache_entry.ex b/lib/dpul_collections/indexing_pipeline/figgy/hydration_cache_entry.ex
index 6b211663..c592a65c 100644
--- a/lib/dpul_collections/indexing_pipeline/figgy/hydration_cache_entry.ex
+++ b/lib/dpul_collections/indexing_pipeline/figgy/hydration_cache_entry.ex
@@ -32,10 +32,38 @@ defmodule DpulCollections.IndexingPipeline.Figgy.HydrationCacheEntry do
       years_is: extract_years(data),
       display_date_s: format_date(metadata),
       page_count_i: page_count(metadata),
-      image_service_urls_ss: image_service_urls(metadata, related_data)
+      image_service_urls_ss: image_service_urls(metadata, related_data),
+      primary_thumbnail_service_url_s: primary_thumbnail_service_url(metadata, related_data)
     }
   end
 
+  defp primary_thumbnail_service_url(
+         %{"thumbnail_id" => thumbnail_id} = metadata,
+         %{"member_ids" => member_data} = related_data
+       )
+       when is_list(thumbnail_id) do
+    thumbnail_member =
+      thumbnail_id
+      |> Enum.at(0, %{})
+      |> Map.get("id")
+      |> then(fn id -> member_data[id] end)
+
+    if is_nil(thumbnail_member) do
+      # When thumbnail id does not correspond to a related FileSet,
+      # use the first image service url
+      image_service_urls(metadata, related_data)
+      |> Enum.at(0)
+    else
+      extract_service_url(thumbnail_member)
+    end
+  end
+
+  defp primary_thumbnail_service_url(metadata, related_data) do
+    # When the thumbnail id is not set, use first image service url
+    image_service_urls(metadata, related_data)
+    |> Enum.at(0)
+  end
+
   defp image_service_urls(%{"member_ids" => member_ids}, related_data) do
     member_ids
     |> Enum.map(&extract_service_url(&1, related_data))
diff --git a/lib/dpul_collections/item.ex b/lib/dpul_collections/item.ex
index 2d6d8d74..344708a0 100644
--- a/lib/dpul_collections/item.ex
+++ b/lib/dpul_collections/item.ex
@@ -8,6 +8,7 @@ defmodule DpulCollections.Item do
     :page_count,
     :url,
     :image_service_urls,
+    :primary_thumbnail_service_url,
     :description
   ]
 
@@ -25,6 +26,7 @@ defmodule DpulCollections.Item do
       page_count: doc["page_count_i"],
       url: generate_url(id, slug),
       image_service_urls: doc["image_service_urls_ss"] || [],
+      primary_thumbnail_service_url: doc["primary_thumbnail_service_url_s"],
       description: doc["description_txtm"] || []
     }
   end
diff --git a/lib/dpul_collections/solr.ex b/lib/dpul_collections/solr.ex
index 3a49e0f4..dffbb1e5 100644
--- a/lib/dpul_collections/solr.ex
+++ b/lib/dpul_collections/solr.ex
@@ -19,7 +19,8 @@ defmodule DpulCollections.Solr do
     "page_count_i",
     "detectlang_ss",
     "slug_s",
-    "image_service_urls_ss"
+    "image_service_urls_ss",
+    "primary_thumbnail_service_url_s"
   ]
 
   @spec query(map(), String.t()) :: map()
diff --git a/lib/dpul_collections_web/live/item_live.ex b/lib/dpul_collections_web/live/item_live.ex
index a1caa5eb..75a0daa6 100644
--- a/lib/dpul_collections_web/live/item_live.ex
+++ b/lib/dpul_collections_web/live/item_live.ex
@@ -38,7 +38,7 @@ defmodule DpulCollectionsWeb.ItemLive do
       <div class="primary-thumbnail md:col-span-2 md:order-first">
         <img
           class="w-full"
-          src={"#{Enum.at(@item.image_service_urls, 0)}/full/525,800/0/default.jpg"}
+          src={"#{@item.primary_thumbnail_service_url}/full/525,800/0/default.jpg"}
           alt="main image display"
           style="
           background-color: lightgray;"
diff --git a/lib/dpul_collections_web/live/search_live.ex b/lib/dpul_collections_web/live/search_live.ex
index bfee927a..fc7f214d 100644
--- a/lib/dpul_collections_web/live/search_live.ex
+++ b/lib/dpul_collections_web/live/search_live.ex
@@ -165,7 +165,7 @@ defmodule DpulCollectionsWeb.SearchLive do
     <div id={"item-#{@item.id}"} class="item">
       <div class="flex flex-wrap gap-5 md:max-h-60 max-h-[22rem] overflow-hidden justify-center md:justify-start relative">
         <.thumbs
-          :for={{thumb, thumb_num} <- Enum.with_index(@item.image_service_urls)}
+          :for={{thumb, thumb_num} <- thumbnail_service_urls(5, @item)}
           :if={@item.page_count}
           thumb={thumb}
           thumb_num={thumb_num}
@@ -343,4 +343,28 @@ defmodule DpulCollectionsWeb.SearchLive do
       type == :post -> [{"...", false}, {page, false}]
     end
   end
+
+  defp thumbnail_service_urls(max_thumbnails, item) do
+    thumbnail_service_urls(
+      max_thumbnails,
+      item.image_service_urls,
+      item.primary_thumbnail_service_url
+    )
+  end
+
+  defp thumbnail_service_urls(max_thumbnails, image_service_urls, nil) do
+    # Truncate image service urls to max value
+    image_service_urls
+    |> Enum.slice(0, max_thumbnails)
+    |> Enum.with_index()
+  end
+
+  defp thumbnail_service_urls(max_thumbnails, image_service_urls, primary_thumbnail_service_url) do
+    # Move thumbnail url to front of list and then truncate to max value
+    image_service_urls
+    |> Enum.filter(&(&1 != primary_thumbnail_service_url))
+    |> List.insert_at(0, primary_thumbnail_service_url)
+    |> Enum.slice(0, max_thumbnails)
+    |> Enum.with_index()
+  end
 end
diff --git a/test/dpul_collections/indexing_pipeline/figgy/hydration_cache_entry_test.exs b/test/dpul_collections/indexing_pipeline/figgy/hydration_cache_entry_test.exs
index 9f5d333f..3fe7f4a1 100644
--- a/test/dpul_collections/indexing_pipeline/figgy/hydration_cache_entry_test.exs
+++ b/test/dpul_collections/indexing_pipeline/figgy/hydration_cache_entry_test.exs
@@ -68,7 +68,8 @@ defmodule DpulCollections.IndexingPipeline.Figgy.HydrationCacheEntryTest do
             "internal_resource" => "EphemeraFolder",
             "metadata" => %{
               "member_ids" => [%{"id" => "1"}],
-              "title" => ["test title 4"]
+              "title" => ["test title 4"],
+              "thumbnail_id" => [%{"id" => "1"}]
             }
           }
         })
@@ -79,6 +80,115 @@ defmodule DpulCollections.IndexingPipeline.Figgy.HydrationCacheEntryTest do
       assert doc[:image_service_urls_ss] == [
                "https://iiif-cloud.princeton.edu/iiif/2/0c%2Fff%2F89%2F0cff895a01ea48959c3da8c6eaab4017%2Fintermediate_file"
              ]
+
+      # Has thumbnail url
+      assert doc[:primary_thumbnail_service_url_s] ==
+               "https://iiif-cloud.princeton.edu/iiif/2/0c%2Fff%2F89%2F0cff895a01ea48959c3da8c6eaab4017%2Fintermediate_file"
+    end
+
+    test "uses first image service url when there is no thumbnail_id property" do
+      {:ok, entry} =
+        IndexingPipeline.write_hydration_cache_entry(%{
+          cache_version: 0,
+          record_id: "0cff895a-01ea-4895-9c3d-a8c6eaab4013",
+          source_cache_order: ~U[2018-03-09 20:19:35.465203Z],
+          related_data: %{
+            "member_ids" => %{
+              "1" => %{
+                "internal_resource" => "FileSet",
+                "id" => "9ad621a7b-01ea-4895-9c3d-a8c6eaab4013",
+                "metadata" => %{
+                  "file_metadata" => [
+                    %{
+                      "id" => %{"id" => "0cff895a-01ea-4895-9c3d-a8c6eaab4017"},
+                      "internal_resource" => "FileMetadata",
+                      "mime_type" => ["image/tiff"],
+                      "use" => [%{"@id" => "http://pcdm.org/use#ServiceFile"}]
+                    }
+                  ]
+                }
+              }
+            }
+          },
+          data: %{
+            "id" => "0cff895a-01ea-4895-9c3d-a8c6eaab4013",
+            "internal_resource" => "EphemeraFolder",
+            "metadata" => %{
+              "member_ids" => [%{"id" => "1"}],
+              "title" => ["test title 4"]
+            }
+          }
+        })
+
+      doc = HydrationCacheEntry.to_solr_document(entry)
+
+      assert doc[:primary_thumbnail_service_url_s] ==
+               "https://iiif-cloud.princeton.edu/iiif/2/0c%2Fff%2F89%2F0cff895a01ea48959c3da8c6eaab4017%2Fintermediate_file"
+    end
+
+    test "uses first image service url when thumbnail id does not point to related FileSet" do
+      {:ok, entry} =
+        IndexingPipeline.write_hydration_cache_entry(%{
+          cache_version: 0,
+          record_id: "0cff895a-01ea-4895-9c3d-a8c6eaab4013",
+          source_cache_order: ~U[2018-03-09 20:19:35.465203Z],
+          related_data: %{
+            "member_ids" => %{
+              "1" => %{
+                "internal_resource" => "FileSet",
+                "id" => "9ad621a7b-01ea-4895-9c3d-a8c6eaab4013",
+                "metadata" => %{
+                  "file_metadata" => [
+                    %{
+                      "id" => %{"id" => "0cff895a-01ea-4895-9c3d-a8c6eaab4017"},
+                      "internal_resource" => "FileMetadata",
+                      "mime_type" => ["image/tiff"],
+                      "use" => [%{"@id" => "http://pcdm.org/use#ServiceFile"}]
+                    }
+                  ]
+                }
+              }
+            }
+          },
+          data: %{
+            "id" => "0cff895a-01ea-4895-9c3d-a8c6eaab4013",
+            "internal_resource" => "EphemeraFolder",
+            "metadata" => %{
+              "member_ids" => [%{"id" => "1"}],
+              "title" => ["test title 4"],
+              "thumbnail_id" => [%{"id" => "9"}]
+            }
+          }
+        })
+
+      doc = HydrationCacheEntry.to_solr_document(entry)
+
+      assert doc[:primary_thumbnail_service_url_s] ==
+               "https://iiif-cloud.princeton.edu/iiif/2/0c%2Fff%2F89%2F0cff895a01ea48959c3da8c6eaab4017%2Fintermediate_file"
+    end
+
+    test "does not add a thumbnail service url when there are no image members" do
+      {:ok, entry} =
+        IndexingPipeline.write_hydration_cache_entry(%{
+          cache_version: 0,
+          record_id: "0cff895a-01ea-4895-9c3d-a8c6eaab4013",
+          source_cache_order: ~U[2018-03-09 20:19:35.465203Z],
+          related_data: %{
+            "member_ids" => %{}
+          },
+          data: %{
+            "id" => "0cff895a-01ea-4895-9c3d-a8c6eaab4013",
+            "internal_resource" => "EphemeraFolder",
+            "metadata" => %{
+              "member_ids" => [],
+              "title" => ["test title 4"]
+            }
+          }
+        })
+
+      doc = HydrationCacheEntry.to_solr_document(entry)
+
+      assert doc[:primary_thumbnail_service_url_s] == nil
     end
 
     test "can handle when members do not have the correct file metadata type" do
diff --git a/test/dpul_collections/indexing_pipeline/integration/full_integration_test.exs b/test/dpul_collections/indexing_pipeline/integration/full_integration_test.exs
index 68b72741..e86abbdc 100644
--- a/test/dpul_collections/indexing_pipeline/integration/full_integration_test.exs
+++ b/test/dpul_collections/indexing_pipeline/integration/full_integration_test.exs
@@ -196,5 +196,8 @@ defmodule DpulCollections.IndexingPipeline.FiggyFullIntegrationTest do
              "https://iiif-cloud.princeton.edu/iiif/2/5e%2F24%2Faf%2F5e24aff45b2e4c9aaba3f05321d1c797%2Fintermediate_file"
              | _rest
            ] = document["image_service_urls_ss"]
+
+    assert "https://iiif-cloud.princeton.edu/iiif/2/5e%2F24%2Faf%2F5e24aff45b2e4c9aaba3f05321d1c797%2Fintermediate_file" =
+             document["primary_thumbnail_service_url_s"]
   end
 end
diff --git a/test/dpul_collections_web/live/item_live_test.exs b/test/dpul_collections_web/live/item_live_test.exs
index 72ae8873..3f05d990 100644
--- a/test/dpul_collections_web/live/item_live_test.exs
+++ b/test/dpul_collections_web/live/item_live_test.exs
@@ -19,6 +19,7 @@ defmodule DpulCollectionsWeb.ItemLiveTest do
             "https://example.com/iiif/2/image1",
             "https://example.com/iiif/2/image2"
           ],
+          primary_thumbnail_service_url_s: "https://example.com/iiif/2/image2",
           description_txtm: ["This is a test description"]
         },
         %{
@@ -29,7 +30,8 @@ defmodule DpulCollectionsWeb.ItemLiveTest do
           image_service_urls_ss: [
             "https://example.com/iiif/2/image1",
             "https://example.com/iiif/2/image2"
-          ]
+          ],
+          primary_thumbnail_service_url_s: "https://example.com/iiif/2/image1"
         },
         %{
           id: 3,
@@ -39,7 +41,8 @@ defmodule DpulCollectionsWeb.ItemLiveTest do
           image_service_urls_ss: [
             "https://example.com/iiif/2/image1",
             "https://example.com/iiif/2/image2"
-          ]
+          ],
+          primary_thumbnail_service_url_s: "https://example.com/iiif/2/image1"
         }
       ],
       active_collection()
@@ -108,10 +111,10 @@ defmodule DpulCollectionsWeb.ItemLiveTest do
              "Download"
            )
 
-    # Large thumbnail renders
+    # Large thumbnail renders using thumbnail service url
     assert view
            |> has_element?(
-             ".primary-thumbnail img[src='https://example.com/iiif/2/image1/full/525,800/0/default.jpg']"
+             ".primary-thumbnail img[src='https://example.com/iiif/2/image2/full/525,800/0/default.jpg']"
            )
 
     assert view
diff --git a/test/dpul_collections_web/live/search_live_test.exs b/test/dpul_collections_web/live/search_live_test.exs
index 0e7e9c51..90aa8c22 100644
--- a/test/dpul_collections_web/live/search_live_test.exs
+++ b/test/dpul_collections_web/live/search_live_test.exs
@@ -53,27 +53,38 @@ defmodule DpulCollectionsWeb.SearchLiveTest do
   end
 
   test "GET /search renders thumbnails for each resource", %{conn: conn} do
-    {:ok, view, _html} = live(conn, "/search?")
+    {:ok, _view, html} = live(conn, "/search?")
 
-    assert view
-           |> has_element?(
-             "#item-1 img[src='https://example.com/iiif/2/image1/square/350,350/0/default.jpg']"
-           )
+    {:ok, document} =
+      html
+      |> Floki.parse_document()
 
-    assert view
-           |> has_element?(
-             "#item-1 img[src='https://example.com/iiif/2/image2/square/350,350/0/default.jpg']"
-           )
+    # There should be a maximum of 5 thumbnails on the search results page
+    assert document |> Floki.find("#item-1 > div > img") |> Enum.count() == 5
 
-    assert view
-           |> has_element?(
-             "#item-2 img[src='https://example.com/iiif/2/image1/square/350,350/0/default.jpg']"
-           )
+    # Odd numbered documents in test data do not have a thumbnail id
+    # so the order of thumbnails should be the same as the image member order
+    assert document
+           |> Floki.attribute("#item-1 > div > :first-child", "src") == [
+             "https://example.com/iiif/2/image1/square/350,350/0/default.jpg"
+           ]
 
-    assert view
-           |> has_element?(
-             "#item-2 img[src='https://example.com/iiif/2/image2/square/350,350/0/default.jpg']"
-           )
+    assert document
+           |> Floki.attribute("#item-1 > div > :nth-child(2)", "src") == [
+             "https://example.com/iiif/2/image2/square/350,350/0/default.jpg"
+           ]
+
+    # Even numbered documents in test data have a thumbnail id so the order
+    # of thumbnails should be different from the image member order
+    assert document
+           |> Floki.attribute("#item-2 > div > :first-child", "src") == [
+             "https://example.com/iiif/2/image2/square/350,350/0/default.jpg"
+           ]
+
+    assert document
+           |> Floki.attribute("#item-2 > div > :nth-child(2)", "src") == [
+             "https://example.com/iiif/2/image1/square/350,350/0/default.jpg"
+           ]
   end
 
   test "searching filters results", %{conn: conn} do
diff --git a/test/support/solr_test_support.ex b/test/support/solr_test_support.ex
index 6f9a88a8..ff4ae6d0 100644
--- a/test/support/solr_test_support.ex
+++ b/test/support/solr_test_support.ex
@@ -2,7 +2,17 @@ defmodule SolrTestSupport do
   def mock_solr_documents(count \\ 100) do
     for n <- 1..count do
       date = 2025 - n
-      page_count = Enum.random(1..10)
+
+      # Equals the number of image service urls
+      page_count = 7
+
+      # Assign thumbnail urls to even numbered documents.
+      # Used for testing thumbnail rendering order
+      thumbnail_url =
+        cond do
+          rem(n, 2) == 0 -> "https://example.com/iiif/2/image2"
+          true -> nil
+        end
 
       %{
         id: n,
@@ -12,8 +22,14 @@ defmodule SolrTestSupport do
         page_count_i: page_count,
         image_service_urls_ss: [
           "https://example.com/iiif/2/image1",
-          "https://example.com/iiif/2/image2"
-        ]
+          "https://example.com/iiif/2/image2",
+          "https://example.com/iiif/2/image3",
+          "https://example.com/iiif/2/image4",
+          "https://example.com/iiif/2/image5",
+          "https://example.com/iiif/2/image6",
+          "https://example.com/iiif/2/image7"
+        ],
+        primary_thumbnail_service_url_s: thumbnail_url
       }
     end
   end